So, two things of note here in the logs.
First, from /var/log/daemon.log:
Apr 10 09:56:30 ubuntu kdm[3311]: X server startup timeout, terminating
Apr 10 09:56:31 ubuntu kdm[3311]: X server died during startup
Apr 10 09:56:31 ubuntu kdm[3311]: Failed to start X server. Starting failsafe X server.
Apr 10 09:56:34 ubuntu init: plymouth-stop pre-start process (4486) terminated with status 1
plymouth-stop is supposed to run before kdm starts; so the fact that
it's running three seconds after kdm, and furthermore that it's failing,
indicates a bug in the ordering.
Second, from /var/log/kdm.log:
/etc/gdm/failsafeXinit: riga 184: zenity: comando non trovato
/etc/gdm/failsafeXinit: riga 47: zenity: comando non trovato
waiting for X server to shut down ddxSigGiveUp: Closing log
It appears that failsafe-X, despite being shipped in x11-common, relies
on both zenity and gdm - so isn't going to work on Kubuntu, where we
have neither by default.
** Package changed: ubuntu => kdebase-workspace (Ubuntu)
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[Lucid Beta2] After first boot Live Kubuntu Netbook doesn't start X and fallback to a textual terminal
https://bugs.launchpad.net/bugs/557930
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